Cloister safety valves and pressure gauge.

Check out these industrial safety valves images:
Cloister safety valves and pressure gauge.

Image by Elsie esq.
Note how the steam pipe loops around the gauge before entering it. This is to ensure any water sits at the lowest point of the loop and does not enter the gauge.
Twin spring safety valves with their test lever

Image by Elsie esq.
. .. and a whistle
Safety

Image by Johnny

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